Something to add to the notes on Lift D’s entry: part of Lift D still remains, having been repurposed for lift evacuation training, containing a few Riblet chairs and a Poma Competition chair. It’s off to your right on the Beaver Run SuperChair right after you go under the Peak 8 SuperConnect.

On Lift B’s entry, I want to note that the vault for the lift’s top drive can still be found at the top of the Mercury SuperChair.

It’s in German, but here’s a video with lots of footage of Quicksilver Quad. You can even see things like how the Sundown trail wasn’t cut until the Beaver Run SuperChair was built (until 1990 there was a big gap between Columbia and American), and how the bottom terminal was in a building identical to the top terminal building. From 1:15 to 1:19, there’s even a brief glimpse of the loading area for Lift D, the Beaver Run SuperChair’s predecessor: